EP0648699B1 - Vorrichtung und Verfahren zum Steuern der Spannung und des Anhaltens in einer Materialbahn - Google Patents

Vorrichtung und Verfahren zum Steuern der Spannung und des Anhaltens in einer Materialbahn Download PDF

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Publication number
EP0648699B1
EP0648699B1 EP94109076A EP94109076A EP0648699B1 EP 0648699 B1 EP0648699 B1 EP 0648699B1 EP 94109076 A EP94109076 A EP 94109076A EP 94109076 A EP94109076 A EP 94109076A EP 0648699 B1 EP0648699 B1 EP 0648699B1
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EP
European Patent Office
Prior art keywords
signal
supply roll
tension
potentiometer
comparator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94109076A
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English (en)
French (fr)
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EP0648699A1 (de
Inventor
Gaylen Roy Hinton
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CMS Gilbreth Packaging Systems Inc
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CMS Gilbreth Packaging Systems Inc
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Publication of EP0648699A1 publication Critical patent/EP0648699A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/06—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle
    • B65H23/063—Registering, tensioning, smoothing or guiding webs longitudinally by retarding devices, e.g. acting on web-roll spindle and controlling web tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/30—Control systems architecture or components, e.g. electronic or pneumatic modules; Details thereof
    • B65H2557/33—Control systems architecture or components, e.g. electronic or pneumatic modules; Details thereof for digital control, e.g. for generating, counting or comparing pulses

Definitions

  • This invention relates to an apparatus and method for controlling the tension and stopping action of web material fed from a web supply roll positioned on a support assembly where a stop signal is generated to a brake during stopping operation of web withdrawal to increase the braking force supplied to the support assembly and prevent overrunning of the supply roll.
  • US-A-3 862 723 discloses a system, namely an apparatus and a method according to the preambles of Claims 1 and 7, for controlling a motor in such a way that the linear velocity of a wire wound on a drum is maintained substantially constant.
  • WO-A-9 107 341 discloses an apparatus for enabling material to drawn off a roll in a direction of withdrawal at an optimum tension, wherein the rotation of a spindle is controlled by measuring an angular displacement and controlling a brake dependent on said measurement.
  • US-A-4 773 610 discloses a vertical axis coil stock feed apparatus having an improved arrangement for controlling movement of the outer winding at the upper end of coils or coil stacks of a widely different height.
  • EP-A-0 458 465 discloses a magnetic braking apparatus with a load detecting means being capable of easily measuring the breaking torque or load.
  • a braking force is typically applied onto the assembly supporting the supply roll to ensure that uniform tension is maintained on the withdrawn web material as it is processed.
  • These supply rolls have high inertia which varies as the roll unwinds and its diameter decreases.
  • the amount of braking force applied onto the support assembly is usually varied depending on the diameter of the roll and its inertia to maintain constant web tension.
  • the braking force on the support assembly must change to maintain the desired web tension and prevent either film breakage caused by excess back tension or prevent overrunning of the web feed caused by a lack of proper tension. Deceleration to a rapid stop position is also difficult because the supply roll can overrun when no additional braking force is applied to compensate for such rapid deceleration. As a result, during rapid supply roll slowdowns into a stop position, additional braking force must be applied onto the support assembly to prevent overruns.
  • a first production run at the start of a shift may require wide, heavy, large diameter rolls of web material.
  • the inertia is primarily in the supply roll itself, and not in the assembly supporting the roll.
  • a stop signal would not have to compensate extensively for the inertia of the support assembly.
  • Other production runs later in the shift may require narrow width, small diameter, lightweight supply rolls, where the inertia of the support assembly has a greater impact on the stopping operation. Thus, the stop signal would have to compensate for the inertia and greater impact of the support assembly.
  • the apparatus of the present invention controls the tension and stopping action of film material fed from a supply roll with an efficient and simple electronic system that generates a stop signal to a braking mechanism of a supply roll support assembly which not only compensates for the varying supply roll diameter as the supply roll unwinds, but also compensates for the rotational inertia of the support assembly.
  • the apparatus includes a supply roll support assembly that supports a supply roll of web material to be withdrawn therefrom.
  • a braking mechanism is operatively connected to the support mechanism for applying a braking force onto the support mechanism and applying tension onto the withdrawn film material.
  • the diameter of the supply roll is sensed and supply roll and tension potentiometers generate an output signal to the braking mechanism that is proportional to the diameter of the supply roll for varying the applied braking force and maintaining constant tension on the withdrawn web material.
  • a stop signal is generated to the braking mechanism during stopping operation of film withdrawal to increase the braking force supplied to the support mechanism.
  • the stop signal comprises the additive combination of a first signal that is essentially proportional to the diameter of the supply roll and a second signal that is essentially constant.
  • the supply roll support assembly is rotatably mounted on a frame.
  • the roll diameter sensing mechanism includes a lever pivotally mounted at one end of the frame. The opposing end of the lever engages the outer periphery of the supply roll mounted on the supply roll support assembly.
  • a supply roll potentiometer is operatively connected to the supported end of the lever so that as the lever pivots, the generated voltage signal from the potentiometer changes corresponding to the varying diameter of the supply roll.
  • a tension potentiometer modifies the signal generated, from the supply roll potentiometer to provide a voltage signal to a comparator indicative of a desired tension setting.
  • a resistor is operatively connected to the braking mechanism and the comparator to provide a circuit voltage to the comparator indicative of the current supplied to the braking means. The signal is therefore proportional to the exerted braking force.
  • a pulse generating mechanism is operatively connected to the comparator for generating a voltage pulse during a stop condition that increases the voltage signal supplied from the supply roll and tension potentiometers to the comparator.
  • a stopping speed potentiometer is operatively connected to the braking mechanism resistor for reducing the value of the circuit voltage to the comparator.
  • a transistor is operatively connected to the stopping speed potentiometer and the pulse generating mechanism for activating the stopping speed potentiometer upon receiving a pulse from the pulse generating mechanism.
  • the present invention controls the tension and stopping action of a web material such as plastic film label material or other similar web material fed from a supply roll into a web processing system such as a bottle labeling system while compensating for the varying supply roll diameter as it unwinds and while compensating for the rotational inertia of the support assembly.
  • a web material such as plastic film label material or other similar web material fed from a supply roll into a web processing system such as a bottle labeling system while compensating for the varying supply roll diameter as it unwinds and while compensating for the rotational inertia of the support assembly.
  • the apparatus for controlling the tension and stopping action of web material fed from a supply roll is illustrated generally at 10 .
  • the apparatus includes a frame assembly indicated generally at 12 formed of individual support trusses and ground engaging members 13 .
  • a supply roll support assembly, indicated generally at 14 is secured to the frame assembly 12 for supporting a supply roll "S" of web material.
  • the supply roll "S” is a convoluted roll of thin film plastic polymer label material which is continually cut into labels in wrap-around labeling of containers.
  • the apparatus and method of the present invention can also be used for controlling the tension and stopping action of different web materials, such as paper, plastic and other similar thin web materials that are typically supplied from a convoluted roll of web material.
  • the support assembly 14 includes a circular supply roll support plate 16 .
  • the support plate 16 is rotatably mounted on the frame 12 by a support shaft 20 and shaft housing 22 rotatably containing the shaft 20 , and a housing frame plate member 24 connected to the frame assembly 12 and supporting the shaft housing 22 .
  • the support shaft 20 is vertically oriented in the shaft housing 22 , and the support plate 16 is secured in a horizontal orientation to the top portion of the support shaft 20 .
  • the support plate 16 includes a central cone 17 on which the supply roll "S" is mounted.
  • the web brake 26 is preferably a magnetic particle brake or other similar type of brake, which is consistent over time as well as consistent in producing a relatively linear torque versus applied signal.
  • a power supply (shown as block 30 in the schematic of Figure 4) provides the power to the brake as is conventional, by energizing a brake coil 31 to provide the braking force.
  • the brake coil 31 typically is an integral part of the web brake 26 .
  • the amount of current generated to the power supply 30 is proportional to the web roll diameter as determined by a web diameter sensing mechanism indicated generally at 32 .
  • the sensing mechanism 32 includes a lever arm 34 that is pivotally mounted on a sensor housing 36 fixed to the frame 12 .
  • the lever arm 34 has one end 34a that engages the outer periphery of the supply roll by spring tension (Figure 3).
  • the other end 34b is fixed to a first circular spur gear 38 that intermeshes with a second spur gear 40 fixed to a supply roll potentiometer 44 .
  • a second tension potentiometer 46 is operatively connected to the first supply roll potentiometer 44 ( Figure 4) and is supported in a sensor housing 36 .
  • the tension potentiometer 46 can be manually adjusted to allow an initial setting of what the tension should be as the film unwinds.
  • the operator manually adjusts the tension potentiometer 46 through a tension adjustment screw 48 contained in the sensor housing 36 ( Figure 3).
  • the signal from the supply roll potentiometer 44 is then modified for the desired tension by the tension adjust potentiometer 46 and fed into a comparator 50 which compares the signal to a circuit voltage applied across a current-sensing resistor 52 . If the current through the brake and power supply is less than that called for by the sensing mechanism 32 , the comparator 50 increases the current to the power supply 30 to the desired level. If less current is necessary, the comparator 50 switches off the supply, allowing the current level to decay to the required level.
  • a stopping transistor 54 and stopping speed potentiometer 56 is contained within the feedback circuit to the comparator 50 , but is normally off so that there is no effect from the stopping speed potentiometer 56 on the voltage from the current sensing resistor that feeds the comparator.
  • a lead wire circuit 36a extends from the sensor housing 36 to the brake housing 22 .
  • a pulse generator (indicated by block 60 ) is activated whenever the machine run circuit 62 or the web feed circuit 64 is turned off.
  • the generated pulse is typically about 2 seconds duration.
  • the pulse increases the voltage to the comparator by directing a portion of the signal through a diode 70 and resistor 72 and adding the value of the pulse to whatever the voltage is that comes from the supply roll and tension potentiometers 44 , 46 .
  • the pulse is generated to the base of the stopping speed transistor 54 , activating the transistor and effectively connecting the side of the stopping speed potentiometer 56 to ground. This effect reduces the value of the signal reaching the comparator 50 from the current sensing resistor 52 by the same ratio as the position of the stopping speed potentiometer 56 .
  • the stopping speed potentiometer 56 is set at 50%, the signal would be reduced to 50% of the original. If the stopping speed potentiometer 56 is set at 25%, the signal would be 25%.
  • the stopping speed can be adjusted by a screw adjust 57 , which is shown mounted on the housing 36 .
  • the components as described can be mounted on a 6201 control board, manufactured by CMS Gilbreth Packaging Systems.
  • a source of AC power 80 supplies power.
  • Both functions of the pulse increase the current to the brake coil 31 , which in turn increases its stopping power to quickly arrest the motion of the web and prevent overrunning.
  • Activating the stopping speed transistor 56 increases the brake tension inversely proportional to the set ratio of the stopping speed potentiometer 56 . If the potentiometer 56 were set at 50%, the brake tension would double for any web diameter. If the only concern were the inertia of the web roll, this function of the stopping speed transistor 54 would only be necessary to stop accurately any diameter web.
  • different web rolls used in processing do not rotate at the same speed and there is always the rotational inertia of the web roll support assembly which must also be stopped. With a small diameter, narrow web roll, the inertia of the support assembly can be many times greater than the inertia of the roll itself. As a result, the second function of the pulse becomes important.
  • the pulse is added directly to the comparator 50 , increasing the brake tension by a fixed amount regardless of web roll diameter.
  • This added tension would be a modest increase from normal tension.
  • this amount of tension added by the pulse directly to the comparator 50 can be several times the normal tension. This additional tension, therefore, tends to compensate for the inertia of the supply roll support assembly 14 .
  • a smaller roll will also be turning at a faster velocity.
  • a greater amount of energy is stored in the rotating system because energy is proportional to the square of the rotational velocity.
  • the added pulse compensates for this increased energy because it not only directly increases the voltage to the comparator 50 , therefore increasing the current to the brake power supply 30 , but the pulse also multiplies the effect of the stopping speed potentiometer 56 . Therefore, by placing an appropriate setting on the stopping speed potentiometer 56 , a braking increase can be created that effectively cancels the increased energy generated with a faster rotating, smaller diameter supply roll.
  • the generated pulse is typically about 2 seconds long. This two-second period typically is long enough for the web-feeding system to decelerate from a high speed into a stopped position. After the system is stopped, the increased brake tension is no longer necessary, and normal tension is resumed.
  • the above invention provides for normal tension as soon as the pulse stops, allowing the web to be rethreaded, repositioned, or adjusted as necessary.

Landscapes

  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Claims (8)

  1. Vorrichtung (10) zum Steuern der Zugspannung und des Anhaltens einer Materialbahn, die von einer Vorratsrolle zugeführt wird, mit Einrichtungen (14) zum Halten einer Vorratsrolle einer davon abzuwickelnden Materialbahn, wirksam mit den Halteeinrichtungen (14) verbundenen Bremseinrichtungen (26) zum Ausüben einer Bremskraft auf die Halteeinrichtungen (14) und zum Ausüben einer Zugspannung auf die abgezogene Materialbahn, Einrichtungen (32) zum Abtasten des Durchmessers der Vorratsrolle und zur Erzeugung eines ersten Signals für die Bremseinrichtungen (26), das proportional zum Durchmesser der Vorratsrolle ist, um die ausgeübte Bremskraft zu verändern und eine konstante Zugspannung auf die abgezogene Materialbahn aufrechtzuerhalten, und einem wirksam mit den Bremseinrichtungen (26) verbundenen Komparator (50) zum Vergleichen einer für den an die Bremseinrichtungen (26) gelieferten Strom kennzeichnenden Schaltungsspannung mit dem ersten für die gewünschte Höhe der Bahnzugspannung für den gegebenen Rollendurchmesser kennzeichnenden Signal zu vergleichen, wobei der Komparator (50) den Betrag der Bremskraft einstellt, um die gewünschte Höhe der Bahnzugspannung bereitzustellen, und die Rollendurchmesser-Abtasteinrichtungen (32) ein Vorratsrollen-Potentiometer (44) aufweisen, das mit dem Komparator (50) wirksam verbunden ist, um ein elektrisches Spannungssignal für den Komparator (50) zu erzeugen, das proportional zum Vorratsrollen-Durchmesser ist,
    gekennzeichnet durch,
    Einrichtungen zum Erzeugen eines Anhaltesignals für die Bremseinrichtungen (26) während des Anhaltevorgangs des Bahnabzugs, um die auf die Halteeinrichtungen (14) ausgeübte Bremskraft zu erhöhen, wobei das Anhaltesignal die additive Kombination des ersten Signals, das proportional zum Durchmesser der Vorratsrolle ist, und eines zweiten Signals, das konstant ist, aufweist, ein Zugspannungs-Potentiometer (46), um das vom Vorratsrollen-Potentiometer (44) erzeugte elektrische Spannungssignal zu verändern, um das erste für eine gewünschte Zugspannungseinstellung kennzeichnende Signal an den Komparator (50) zu liefern, und impulserzeugende Einrichtungen, die wirksam mit dem Komparator (50) verbunden sind, um einen elektrischen Spannungsimpuls während eines Anhaltezustands zu erzeugen, das das zweite Signal bereitstellt, das dem ersten vom Zugspannungs-Potentiometer an den Komparator (50) gelieferten Signal hinzuaddiert wird.
  2. Vorrichtung nach Anspruch 1, mit einem Widerstand (52), der wirksam mit den Bremseinrichtungen (26) und dem Komparator (50) verbunden ist, um die für den an die Bremseinrichtungen (26) gelieferten Strom kennzeichnende Schaltungsspannung an den Komparator (50) zu liefern, wobei die Schaltungsspannung ein Signal ist, das proportional zum Betrag der durch die Bremseinrichtungen (26) ausgeübten Bremskraft ist.
  3. Vorrichtung nach Anspruch 1 oder 2, mit Anhaltegeschwindigkeits-Potentiometer-Einrichtungen (56), die wirksam mit dem Widerstand (52) verbunden sind, um den Wert der für den an die Bremseinrichtungen (26) gelieferten Strom kennzeichnenden Schaltungsspannung zu reduzieren, die für den Komparator (50) erzeugt wird, und Transistor-Einrichtungen (54), die wirksam mit dem Anhaltegeschwindigkeits-Potentiometer (56) und den impulserzeugenden Einrichtungen verbunden sind, um das Anhaltegeschwindigkeits-Potentiometer (56) auf den Empfang des elektrischen Spannungsimpulses von den impulserzeugenden Einrichtungen hin zu aktivieren.
  4. Vorrichtung (10) nach Anspruch 1, 2 oder 3, mit einem Rahmen (12), wobei die Halteeinrichtungen (14) der Vorratsrolle drehbar an dem Rahmen (12) befestigt sind, die Rollen-Durchmesser-Abtasteinrichtungen (32) einen Hebelarm (34) aufweisen, der drehbar an einem Ende des Rahmens (12) befestigt ist, das gegenüberliegende Ende (34a) des Hebelarms an dem äußeren Umfang einer Vorratsrolle angreift, die an den Halteeinrichtungen (14) der Vorratsrolle befestigt ist, und das Vorratsrollen-Potentiometer (44) wirksam mit dem drehbar befestigten Ende des Hebelarms (34) verbunden ist, um das erste Signal an die Bremseinrichtungen (26) entsprechend der Drehbewegung des Hebelarms (34) zu erzeugen.
  5. Vorrichtung nach einem der Ansprüche 1 bis 4, wobei die Halteeinrichtungen (14) der Vorratsrolle eine waagrecht angeordnete Halteoberfläche (16) aufweisen, auf der eine Vorratsrolle einer Materialbahn angeordnet ist.
  6. Vorrichtung nach einem der Ansprüche 1 bis 5, wobei die Bremseinrichtungen (26) eine Magnetpulverbremse aufweisen.
  7. Verfahren zum Steuern der Zugspannung und des Anhaltens einer Materialbahn, die von einer Vorratsrolle zugeführt wird, mit den folgenden Verfahrensschritten:
    Abtasten des Durchmessers einer Vorratsrolle, die drehbar an Halteeinrichtungen (14) befestigt ist, und Erzeugung eines ersten Signals an eine Bremse (26), die wirksam mit den Halteeinrichtungen (14) verbunden ist, um eine Bremskraft auf die Halteeinrichtungen (14) auszuüben, um die auf die Halteeinrichtungen (14) ausgeübte Bremskraft zu verändern, um eine konstante Zugspannung auf die Materialbahn aufrechtzuerhalten, und Vergleichen einer für den der Bremse (26) zugeführten Strom kennzeichnende Schaltungsspannung mit dem ersten für den gewünschten Zugspannungswert für einen gegebenen Rollendurchmesser kennzeichnenden Signal und Einstellen der Höhe der Bremskraft, um den gewünschten Zugspannungswert bereitzustellen, gekennzeichnet durch die folgenden Schritte:
    Abziehen von Folie von der Vorratsrolle, Erzeugung eines Anhaltesignals für die Bremse (26) während eines Anhaltevorgangs des Bahnabzugs, um die auf die Halteeinrichtungen (14) ausgeübte Bremskraft zu erhöhen, wobei das Anhaltesignal die additive Kombination des ersten Signals, das proportional zum Durchmesser der Vorratsrolle ist, und eines zweiten Signals, das konstant ist, aufweist, Erzeugung eines Signals von einem Vorratsrollen-Potentiometer (44), das proportional zum Vorratsrollen-Durchmesser ist und Abändern dieses Signals durch ein Zugspannungs-Potentiometer (46), um das erste für die gewünschte Zugspannungseinstellung kennzeichnende Signal in dem Vergleichsschritt bereitzustellen, und Erzeugung eines elektrischen Spannungsimpulses während eines Anhaltezustands, der das zweite Signal liefert, das zum ersten vom Zugspannungs-Potentiometer (46) gelieferten Signal addiert wird.
  8. Verfahren nach Anspruch 7, wobei in einem weiteren Schritt der Schaltungsspannungswert verringert wird, der kennzeichnend für den Strom ist, der der Bremse (26) durch Aktivierung eines Anhaltegeschwindigkeits-Potentiometers (56) durch einen Transistor (54), der den erzeugten elektrischen Spannungsimpuls empfängt, zugeführt wird.
EP94109076A 1993-10-15 1994-06-14 Vorrichtung und Verfahren zum Steuern der Spannung und des Anhaltens in einer Materialbahn Expired - Lifetime EP0648699B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/138,476 US5441210A (en) 1993-10-15 1993-10-15 Apparatus and method for controlling tension and stopping action of web material
US138476 1993-10-15

Publications (2)

Publication Number Publication Date
EP0648699A1 EP0648699A1 (de) 1995-04-19
EP0648699B1 true EP0648699B1 (de) 1997-08-13

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EP94109076A Expired - Lifetime EP0648699B1 (de) 1993-10-15 1994-06-14 Vorrichtung und Verfahren zum Steuern der Spannung und des Anhaltens in einer Materialbahn

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Country Link
US (1) US5441210A (de)
EP (1) EP0648699B1 (de)
JP (1) JPH07172647A (de)
KR (1) KR950011295A (de)
AU (1) AU659046B1 (de)
BR (1) BR9403103A (de)
CA (1) CA2131410A1 (de)
DE (1) DE69404936T2 (de)
ES (1) ES2108336T3 (de)
PL (1) PL305420A1 (de)

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CA2131410A1 (en) 1995-04-16
EP0648699A1 (de) 1995-04-19
DE69404936D1 (de) 1997-09-18
AU659046B1 (en) 1995-05-04
PL305420A1 (en) 1995-04-18
DE69404936T2 (de) 1997-12-11
KR950011295A (ko) 1995-05-15
JPH07172647A (ja) 1995-07-11
ES2108336T3 (es) 1997-12-16
US5441210A (en) 1995-08-15
BR9403103A (pt) 1995-06-06

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